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External drive un-mounting then re-mounting...
Posted by: DeusxMac
Date: January 02, 2018 01:48PM
...several times a day.

USB 3, and connected to a powered USB 3 hub (HooToo branded).

When it first occurred I assumed it was a bad USB cable, so changed it.
That didn't cure it so I then thought it was a failing HD enclosure, so got a new one. Again no joy.
Then tested the new enclosure on another Mac; no problems.

Now I'm thinking that it's the hub itself that's failing (or maybe it's not delivering as much power as it's supposed to.)

Has anyone had a powered hub cause un-mounting and re-mounting like this?


[iMac 21.5", 2017 running OS 10.13.2]
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Re: External drive un-mounting then re-mounting...
Posted by: GuyGene
Date: January 02, 2018 02:21PM
Hmmmm...power supply? Okay, calling Onamuji, calling Onamuji. And a few others...



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Re: External drive un-mounting then re-mounting...
Posted by: ka jowct
Date: January 02, 2018 02:29PM
What OS are the two Macs running?
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Re: External drive un-mounting then re-mounting...
Posted by: OWC Larry
Date: January 02, 2018 02:29PM
Either power supply problem or the hub itself has a chipset failure occurring. Any other storage devices on it that are powered - if so - if they are having dismounts, then definitely hub. Otherwise power supply makes sense - again, assuming this all worked fine before. If not, hub itself may not do a good job of power delivery.



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Other World Computing
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Re: External drive un-mounting then re-mounting...
Posted by: Spiff
Date: January 02, 2018 04:01PM
What's the power to the house doing? Is it fluctuating? If so, then that could cause the problems as well. I have gone to a battery backup system that keeps things humming along quite well as we have occasional flickers at our house.
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Re: External drive un-mounting then re-mounting...
Posted by: jdc
Date: January 02, 2018 04:16PM
Hub would have been my first guess as to the problem. They just dont last.

Id try the drive connected directly to the iMac -- $1 says that fixes it.

New hub...



----


Edited 999 time(s). Last edit at 12:08PM by jdc.
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Re: External drive un-mounting then re-mounting...
Posted by: NewtonMP2100
Date: January 02, 2018 05:45PM
.....the drive is probably male.....



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Re: External drive un-mounting then re-mounting...
Posted by: Onamuji
Date: January 02, 2018 09:39PM
The operative question is this: Does the drive exhibit the same symptom when connected directly to the Mac?



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Re: External drive un-mounting then re-mounting...
Posted by: rexs
Date: January 02, 2018 10:06PM
My Hack and my wife's mini both do it.
My search for the cure has led me to the opinion that each idea has fixed 0 to 1 persons problem.
A couple of folks have guessed it might be heat related.
I'm going to try some deep cleaning tomorrow.
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Re: External drive un-mounting then re-mounting...
Posted by: S. Pupp
Date: January 03, 2018 09:08AM
I have this trouble with two PC's with built-in and PCIe cards with Asmedia and NEC chipsets, and just about every USB3 external drive I've tried.
With bus powered drives, it definitely happens less if a splitter is used to power the drive from two USB3 ports. With externally powered drives, nothing seems to help, including using a high quality 18" cable. I've not tried the drives on my Mac yet, but it seems unlikely that 4 different drives from 4 manufacturers are all bad.

If connecting directly to the Mac does not solve the issue, then try a USB 2.0 hub. You'll lose speed, but gain stability.
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